body {
    background: #eae5e5;
}

.app {
    width: 900px;
    margin: auto;
    background: #f4e8e1;
}

.container {
    /* background: #fff; */
}

 .navHead {
    height: 200px;
    overflow: hidden;
}

.clearfix:after {
    visibility: hidden;
    display: block;
    font-size: 0;
    content: " ";
    clear: both;
    height: 0;
}

.introduceMain>div>img {
    height: 200px;
    width: 280px;
}

.introduce {
    margin: 5px;
}

.introduce>div {
    float: left;
}

.introduce img {
    height: 200px;
    width: 280px;
}

.introduce>div>h3 {
    background: #d98454;
}

.introduceMain,.buyMain,.concat{
    display: none
}

.active {
    display: block;
}